His voice sounds soft.

他的声音听起来软软的。

youdao

Lanolin: it sounds soft and comforting, like the kind of fluffy material you'd use to protect a grazed knee.

羊毛脂：听起来让人感觉柔软舒服，就像您平日用的那松软的、附着绒毛的护膝。

youdao

He became aware of the soft, faint sounds of water dripping.

他开始觉察到水滴下来的轻柔、微弱的声音。

《柯林斯英汉双解大词典》

At its worst, this produces the alcoholic beverage equivalent of elevator music, the Soft Sounds of Lager.

FORBES: Czech Mate

The soft sounds of music and speech are amplified in the enhancement mode.

ENGADGET: Etymotic Music?Pro 9-15 earplugs bring high-end hush to audiences, lets us enjoy speed metal safely

Water running through the reeds in the canal beside them made soft gulping sounds as it swirled along.

NEWYORKER: Nawabdin Electrician